A. This procedure includes guidance on inspecting
for and
clearing out blocked internal storm
drains. Prevention
of potentially blocking debris from
entering the drains
via the roof is an important factor
in preventing blocked
drains. See 3.01 A.1. and A.2.
below for preventive
maintenance guidance.

B. See 01100-07-S for general project guidelines
to be
reviewed along with this procedure.
These guidelines
cover the following sections:

1. Safety Precautions

2. Historic Structures Precautions

3. Submittals

4. Quality Assurance

5. Delivery, Storage and Handling

6. Project/Site Conditions

7. Sequencing and Scheduling

8. General Protection (Surface
and Surrounding)

These guidelines should be reviewed
prior to performing
this procedure and should be followed,
when applicable,
along with recommendations from the
Regional Historic
Preservation Officer (RHPO).

A. Diagnostic Equipment: High performance durable
camera/transmitter system equipped with
small black and
white camera head and pipe location
transmitter; able to
negotiate multiple 90 degree bends in
2" to 10", such as
"SeeSnake Diagnostic Tools"
(RIDGID/Kollmann), or
approved equal.

B. Drain cleaning equipment such as an auger and/or
saw
tooth cutter (Ridgid/Kollmann), or approved
equal, as
required for the specific blockage type.

PART 3---EXECUTION

3.01 EXAMINATION

A. Examine the foundation and exterior of the building
by
walking around the building during a
heavy rain storm.
Look for blocked or broken storm drains,
leaking or
overflowing gutters or perforated downspouts.
Notice
where water is ponding on the ground
around the building.

1. Clean gutters and downspouts
twice a year - in late
spring and in late fall.

2. Provide screen barriers at
gutter outlets to
prevent debris from entering
into the downspout and
storm drain system.

B. Examine interior walls where internal roof drains
run
vertically, to identify staining, failed
paint, failed
plaster or other signs of water damage
near the drains.

3.02 ERECTION, INSTALLATION, APPLICATION

CAUTION: DO NOT ATTEMPT TO FLUSH DRAINS WITH WATER TO REMOVE
DEBRIS. EXCESSIVE PRESSURE CAN CREATE INTERNAL LEAKS,
CAUSING
STAINING AND DAMAGE TO ADJACENT BUILDING MATERIALS. INSPECT
ANNUALLY; OPEN AND CLEAN-OUT ACCESSIBLE POINTS PERIODICALLY.

A. When there is apparent blockage and signs of water
damage
inside the building, use "low-tech"
attempts such as
routers to clear the drain. If
these attempts are not
successful, it is possible to identify
the problem via
new video tools.

B. Identify the problem through video inspection
and
determine the fault location as accurately
as possible
using a high-performance camera/transmitter
system.

1. Plug in the system and turn
on the monitor.

2. Push the camera head into
the line and continue to
slowly feed it through.
Follow manufacturer's
instructions.

3. Blockages will be evident
on the video monitor as
viewed by the camera.

4. Once the blockage has been
identified, use the
location transmitter
to accurately identify its
location. Follow
manufacturer's instructions.

B. Remove blockages using a mechanical auger or tooth
cutter
as required for the type of blockage.
Follow
manufacturer's instructions. If
necessary, excavate the
section of drain line in question and
replace any cracked
or broken pipe.